Join Date: Oct 2002
Location: sf east bay ca.
Thanked 415 Times in 333 Posts
Engine Miss + SES = CPS?
While at sears point this past weekend, under a couple of pretty hard runs, about 20min into a session on the track, i get a pretty heavy miss and an SES light. Oil temp about 240, coolant temp right in the middle (i know that means little), engine very weak, but will rev beyond 4k (so not limp home, right?). I pull into the hot pit, shut off for 20sec or so, re-start and all if fine, no SES, car runs great, back on track...
(i should add, i took a few runs with some students/passengers in c and d run groups, not pushing the car as hard, and no problem with misses/ses)
Happens again, do the same, happens again, do the same. On the drive home, car feels a bit sluggish (maybe i'm just feeling slow after being at the track though) and i think the exhaust tone might sound different (could be mental as i've already been thinking cam sensor). Get home, let car cool, take a drive, all seems fine.
Pull out the Peak, table 18, codes 01, 63 (or b3), C4 and C6.
Code01, i think a red herring. I had the car dynoed a couple months ago, the shop pulled the wrong fuse (they initially pulled 17 and 31, 31 is for fuel pump). Code 01 is fuel pump relay. Maybe meaningless?
Code 63 is some self test thing, so that doesn't sound related (and my car seems to have this code often, without an ses light. If it's b3, that cat efficiency, bank 5-8, still doesn't sound like that'd cause a miss. (and i have new cats).
Codes C4 &6 are misfire, cyl 1 and cyl 3. OK, so i know which cylinders were missing, but why? Wouldn't a CPS throw a cps code?
Any thought's appreciated, i'm CPO, so i'll call the dealer tomorrow, but i'm curious.
93 M5 3.8 Sterling Silver, Black 5/93 production (euro)
94 M5 Touring Madeira Schwarz, Black 10/93 production
00 M5 Carbon Black, Black exclusive
Last edited by mottati; 7th March 2005 at 08:04 AM.